Event definition is not working for a button click

I can’t seem to get the definitions of several events right. Hopefully someone can tell me what I am doing wrong.

I have a button ‘Filters’. 
 

The html code involving this button:

<div class="webix_el_box" style="width:100px; height:38px">
<button type="button" class="webix_button webix_img_btn" style="line-height:32px;" 
<span class="webix_icon_btn filter-icon" style="max-width:32px;">
</span>Filters
</button>
</div>

What I tried for event defintion:

We are using Webix as a ReactJS framework.